Check the log where the failed method was executed. In the above example, it was the IsFullyRegistred method in BM_Container. There should be the following error in generic_worker.log (or in BA<6.0 BM.log):

You will see the privileges that allow the method to be executed. In this example, user 1007028 does not have the ACCOUNTS_VIEW_DET or the CUST_MAKE_PURCHASES privilege.

Generally, resolving the issue means assigning the missing privileges to the user. However, do not blindly assign the privileges. Check which were supposed to be assigned, and why they were not, as this may be a symptom of a bug or a misconfiguration. Additional note, sometimes BA restart is required to update the role (https://kb.odin.com/en/128840).